Assigm



(No Medal.)

J.O"GRADY..

INSERTIBLB SAW TOOTH.

No. 286,478. Patented Oct. 9, 1883.

INVENTOR.

ATTORNEYS.

UNIT D STATES PATENT rricn.

JOHN OGRADY, OF COLUMBUS, OHIO, ASSIGNOR TO FRANK. OHLEN, OF

SAME PLACE.

AW-TOOTH.

SPECIFICATION forming part of Letters Patent No. 288,478, dated October 9, 1883.

Application filed July 5, 1883. (No model.)

To all whom it may concern:

Be it known that I, JOHN O GRADY, a citizen of the United States, and a resident of Columbus, in the county of Franklin and State of 5 Ohio, have invented certain new and useful Improvements in Insertible Saw-Teeth; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same,

reference being had to the accompanying drawings, which form a part of this specification, and in which Figure 1 is a side view of a portion of a cir- I 5 cular saw provided with my improved insertible tooth. Fig. 2 is a vertical longitudinal section of the same. Fig. 3 is a crosssection of the same on line as x,-Fig. 1; and Figs. 4, 5, and 6 are perspective detail views of the several parts of the saw, tooth, and key-piece detached.

Similar letters of reference indicate corresponding parts in all the figures.

My invention has relation to insertible teeth 2 5 for saws; and it consists in the improved construction and combination of parts of an insert-ible tooth, which is held in place by a segmental key, as hereinafter more fully described and claimed.

0 In the accompanying drawings, the letter A indicates the body or blade of the saw, the outer edge of which has a series of recesses, B, forming circle-segments, the side of which 0, facing in the direction of the rotation, is cut 3 5 on straight and cut into the side of the recess at a sharp angle to the outer edge of the saw, forming a shoulder, D. The edges of the recesses are beveled to both sides, forming tongues V-shaped in section, and the straight side 0 0 is beveled in the same manner, while the shoulder D is flat.

, E is the tooth, the rear side or edge, F,'of which is straight and grooved to correspond to the tongue upon the side 0 of the recess,

5 while its front edgeforms, at itslower portion, a circle-segment, G, which is tongued in the same manner as the edgeof the recess, and is concentric with the same, but of a larger radius. The lower end of the tooth is rounded at the rear corner, corresponding to the shape of the corner in the recess, and the remaining portion of the lower end is flat, fitting and bearing against the fiat portion of the shoulder D.

A segmental key, H, having a grooved edge, 5 5

shoulder formed by the straight and the segmental portion of the recess. The outer edge of the segmental key is cut out in the manner usual in the teeth of a circular saw, and the key has two perforations, L, into which two projecting lugs, M, upon the key or wrench may fit, serving to turn the key-piece, releasing or fastening the tooth.

The straight edge 0 of the recess has a notch near its middle, and the straight edge of the tooth has a small projection, N, projecting 7 5- above the bottom of the groove and fitting into a notch 'in the straight edge of the recess, thus preventing the tooth from slipping up out of its position. The back of the tooth forms a continuation of the outer edge of the saw-blade, and the point is widened into chisel shape, as usually done in circular saws, for the purpose of cutting freely and without too much friction upon the sides of the saw.

It will be seen that .by this construction of 8 5 an insertible saw-tooth the tooth may be re- 7 moved and again inserted in a moment of time, and that by having the teeth small, fastened by the segmental key-piece, a supply of extra teeth may be kept on hand without occupying go much room, and may be inserted in the case of an accident to any of theteeth.

I'am aware that insertible saw-teeth have been made having a straight rear edge and segmental front edge, and secured in segmental recesses in the saw-blade by means of correspondingly-shaped key-pieces, and I do not wish to claim such construction, broadly; but

What I claim, and desire to secure by Let ters Patent of the United States, is

The combination of the tooth E, having grooved edges I and J, and forming shoulder 10 straight grooved rear edges, F, provided with K, as and for the purpose shown and set forth. projeotion'N, and the bottom of the groove In testimony that I claim the foregoing as and segmental tongued front edge, G, the saw my own I have hereunto affixed my signature 7 5 A, having recesses 13, provided Withatongued in presence of two witnesses.

edge, and having the edge 0, facing the direc- J OHN OGRADY.

tion of rotation, straight and tongued, provid XVitnesses: ed With a notch, O, and forming a flat shoul- PETER LEAVY,

der, D, and a segmental key-piece, I-I, having BERNARD CASEY. 

